Given markdown;
a **b** c

Execute (bold):
  AssertNotEqual SyntaxOf('a'), 'htmlBold'
  AssertEqual SyntaxOf('b'), 'htmlBold'
  AssertNotEqual SyntaxOf('c'), 'htmlBold'

Given markdown;
a *b* c

Execute (italic):
  AssertNotEqual SyntaxOf('a'), 'htmlItalic'
  AssertEqual SyntaxOf('b'), 'htmlItalic'
  AssertNotEqual SyntaxOf('c'), 'htmlItalic'

# Links

Given markdown;
[a](b)

Execute (link with title):
  AssertEqual SyntaxOf('a'), 'mkdLink'
  AssertEqual SyntaxOf('b'), 'mkdURL'

Given markdown;
(a)

(b)

Execute (parenthesis not in link):
  AssertNotEqual SyntaxOf('a'), 'mkdURL'
  AssertNotEqual SyntaxOf('b'), 'mkdURL'

Given markdown;
[a](b) c [d](e)

Execute (multiple links on a line):
  AssertEqual SyntaxOf('c'), ''

# Autolinks

Given markdown;
a <http://b> c

Execute (autolink):
  AssertNotEqual SyntaxOf('a'), 'mkdInlineURL'
  AssertEqual SyntaxOf('<'), 'mkdDelimiter'
  AssertEqual SyntaxOf('b'), 'mkdInlineURL'
  AssertEqual SyntaxOf('>'), 'mkdDelimiter'
  AssertNotEqual SyntaxOf('c'), 'mkdInlineURL'

Given markdown;
<HtTp://a>

Execute (autolink with scheme case is insensitive):
  AssertEqual SyntaxOf('a'), 'mkdInlineURL'

Given markdown;
<notascheme://a>

Execute (autolink without known scheme is not a link):
  AssertNotEqual SyntaxOf('n'), 'mkdInlineURL'

Given markdown;
<a>

Execute (autolink without scheme is not a link):
  AssertNotEqual SyntaxOf('a'), 'mkdInlineURL'

Given markdown;
< http://a >
<http://b c>
<http://d
e>

Execute (autolink with space is not a link):
  AssertNotEqual SyntaxOf('a'), 'mkdInlineURL'
  AssertNotEqual SyntaxOf('b'), 'mkdInlineURL'
  AssertNotEqual SyntaxOf('c'), 'mkdInlineURL'
  AssertNotEqual SyntaxOf('d'), 'mkdInlineURL'
  AssertNotEqual SyntaxOf('e'), 'mkdInlineURL'

Given markdown;
\<http://a>

Execute (autolinks can be backslash escaped):
  AssertNotEqual SyntaxOf('<'), 'mkdDelimiter'

# Code Blocks

Given markdown;
~~~
code
~~~

Execute (code blocks can be fenced with tildes):
  AssertEqual SyntaxOf('c'), 'mkdCode'

Given markdown;
~~~ruby
code
~~~

Execute (code blocks can have a language specifier):
  AssertEqual SyntaxOf('c'), 'mkdCode'

# Math

Given markdown;
a $x$ b
c $$y$$ d
\$e\$
\$\$f\$\$

Execute (math):
  AssertNotEqual SyntaxOf('x'), 'mkdMath'
  AssertNotEqual SyntaxOf('y'), 'mkdMath'
  let g:vim_markdown_math=1
  syn off | syn on
  AssertNotEqual SyntaxOf('a'), 'mkdMath'
  AssertNotEqual SyntaxOf('b'), 'mkdMath'
  AssertNotEqual SyntaxOf('c'), 'mkdMath'
  AssertNotEqual SyntaxOf('d'), 'mkdMath'
  AssertNotEqual SyntaxOf('e'), 'mkdMath'
  AssertNotEqual SyntaxOf('f'), 'mkdMath'
  AssertEqual SyntaxOf('x'), 'mkdMath'
  AssertEqual SyntaxOf('y'), 'mkdMath'
  let g:vim_markdown_math=0
  syn off | syn on
  AssertNotEqual SyntaxOf('x'), 'mkdMath'
  AssertNotEqual SyntaxOf('y'), 'mkdMath'

Given markdown;
a

$
b
$

c

Execute (multiline math):
  let g:vim_markdown_math=1
  syn off | syn on
  AssertNotEqual SyntaxOf('a'), 'mkdMath'
  AssertEqual SyntaxOf('b'), 'mkdMath'
  AssertNotEqual SyntaxOf('c'), 'mkdMath'

# YAML frontmatter

Given markdown;
---
a: b
---

Execute (YAML frontmatter is controlled by the option):
  AssertNotEqual SyntaxOf('a'), 'yamlBlockMappingKey'
  let g:vim_markdown_frontmatter=1
  syn off | syn on
  AssertEqual SyntaxOf('a'), 'yamlBlockMappingKey'
  let g:vim_markdown_frontmatter=0
  syn off | syn on
  AssertNotEqual SyntaxOf('a'), 'yamlBlockMappingKey'

Given markdown;

---
a: b
---

Execute (YAML frontmatter only works if it's the first thing in the file):
  let g:vim_markdown_frontmatter=1
  syn off | syn on
  AssertNotEqual SyntaxOf('a'), 'yamlBlockMappingKey'

Given markdown;
---
a: b
---

---

Execute (rules are not mistaken by YAML frontmatter delimiters):
  let g:vim_markdown_frontmatter=1
  syn off | syn on
  AssertEqual SyntaxAt(5, 1), 'mkdRule'